I'm not as avid about my DVD collection as I am about my NES collection. But anyways...

I've got:

Legend
Lawnmower Man
Warlock
Battlefield Earth
Merlin (yeah the TV miniseries one)
Willow
Mortal Kombat
Highlander
Bram Stoker's Dracula
Dracula 2000
Dracula 2

My favorite is probably either Warlock or Legend. Lawnmower Man is good too, but only if you disregard that godawful sequel.